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PrefixAwareRecursionInterceptor (Plexus Interpolation API 1.11 API)
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org.codehaus.plexus.interpolation</FONT>
<BR>
Class PrefixAwareRecursionInterceptor</H2>
<PRE>
java.lang.Object
  <IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>org.codehaus.plexus.interpolation.PrefixAwareRecursionInterceptor</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../org/codehaus/plexus/interpolation/RecursionInterceptor.html" title="interface in org.codehaus.plexus.interpolation">RecursionInterceptor</A></DD>
</DL>
<HR>
<DL>
<DT><PRE>public class <B>PrefixAwareRecursionInterceptor</B><DT>extends java.lang.Object<DT>implements <A HREF="../../../../org/codehaus/plexus/interpolation/RecursionInterceptor.html" title="interface in org.codehaus.plexus.interpolation">RecursionInterceptor</A></DL>
</PRE>

<P>
<A HREF="../../../../org/codehaus/plexus/interpolation/RecursionInterceptor.html" title="interface in org.codehaus.plexus.interpolation"><CODE>RecursionInterceptor</CODE></A> implementation that provides support for expressions
 with multiple synonyms, such as project.build.directory == pom.build.directory ==
 build.directory in Maven's POM.
<P>

<P>
<DL>
<DT><B>Version:</B></DT>
  <DD>$Id: PrefixAwareRecursionInterceptor.java 7529 2008-07-20 20:24:21Z olamy $</DD>
<DT><B>Author:</B></DT>
  <DD>jdcasey</DD>
</DL>
<HR>

<P>
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<CODE>static&nbsp;java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/codehaus/plexus/interpolation/PrefixAwareRecursionInterceptor.html#DEFAULT_END_TOKEN">DEFAULT_END_TOKEN</A></B></CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
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<CODE>static&nbsp;java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/codehaus/plexus/interpolation/PrefixAwareRecursionInterceptor.html#DEFAULT_START_TOKEN">DEFAULT_START_TOKEN</A></B></CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
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<TD><CODE><B><A HREF="../../../../org/codehaus/plexus/interpolation/PrefixAwareRecursionInterceptor.html#PrefixAwareRecursionInterceptor(java.util.Collection)">PrefixAwareRecursionInterceptor</A></B>(java.util.Collection&nbsp;possiblePrefixes)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Use the specified expression prefixes to detect synonyms.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../../org/codehaus/plexus/interpolation/PrefixAwareRecursionInterceptor.html#PrefixAwareRecursionInterceptor(java.util.Collection, boolean)">PrefixAwareRecursionInterceptor</A></B>(java.util.Collection&nbsp;possiblePrefixes,
                                boolean&nbsp;watchUnprefixedExpressions)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Use the specified expression prefixes to detect synonyms, and specify whether
 unprefixed expressions can be considered synonyms.</TD>
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<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/codehaus/plexus/interpolation/PrefixAwareRecursionInterceptor.html#expressionResolutionFinished(java.lang.String)">expressionResolutionFinished</A></B>(java.lang.String&nbsp;expression)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Signal to the interceptor that the all efforts to resolve the given
 expression have completed - whether successfully or not is irrelevant -
 and that the expression should not be tracked for recursion any longer.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/codehaus/plexus/interpolation/PrefixAwareRecursionInterceptor.html#expressionResolutionStarted(java.lang.String)">expressionResolutionStarted</A></B>(java.lang.String&nbsp;expression)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Log the intention to start resolving the given expression.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;java.util.List</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/codehaus/plexus/interpolation/PrefixAwareRecursionInterceptor.html#getExpressionCycle(java.lang.String)">getExpressionCycle</A></B>(java.lang.String&nbsp;expression)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;When an expression is determined to be a recursive reference, this method
 returns the sublist of tracked expressions that participate in this cycle.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/codehaus/plexus/interpolation/PrefixAwareRecursionInterceptor.html#hasRecursiveExpression(java.lang.String)">hasRecursiveExpression</A></B>(java.lang.String&nbsp;expression)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Check whether the given value contains an expression that is currently
 being tracked by this interceptor.</TD>
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<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
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<A NAME="DEFAULT_START_TOKEN"><!-- --></A><H3>
DEFAULT_START_TOKEN</H3>
<PRE>
public static final java.lang.String <B>DEFAULT_START_TOKEN</B></PRE>
<DL>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../constant-values.html#org.codehaus.plexus.interpolation.PrefixAwareRecursionInterceptor.DEFAULT_START_TOKEN">Constant Field Values</A></DL>
</DL>
<HR>

<A NAME="DEFAULT_END_TOKEN"><!-- --></A><H3>
DEFAULT_END_TOKEN</H3>
<PRE>
public static final java.lang.String <B>DEFAULT_END_TOKEN</B></PRE>
<DL>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../constant-values.html#org.codehaus.plexus.interpolation.PrefixAwareRecursionInterceptor.DEFAULT_END_TOKEN">Constant Field Values</A></DL>
</DL>

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<A NAME="PrefixAwareRecursionInterceptor(java.util.Collection, boolean)"><!-- --></A><H3>
PrefixAwareRecursionInterceptor</H3>
<PRE>
public <B>PrefixAwareRecursionInterceptor</B>(java.util.Collection&nbsp;possiblePrefixes,
                                       boolean&nbsp;watchUnprefixedExpressions)</PRE>
<DL>
<DD>Use the specified expression prefixes to detect synonyms, and specify whether
 unprefixed expressions can be considered synonyms.
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>possiblePrefixes</CODE> - The collection of expression prefixes supported<DD><CODE>watchUnprefixedExpressions</CODE> - Whether to consider unprefixed expressions as synonyms</DL>
</DL>
<HR>

<A NAME="PrefixAwareRecursionInterceptor(java.util.Collection)"><!-- --></A><H3>
PrefixAwareRecursionInterceptor</H3>
<PRE>
public <B>PrefixAwareRecursionInterceptor</B>(java.util.Collection&nbsp;possiblePrefixes)</PRE>
<DL>
<DD>Use the specified expression prefixes to detect synonyms. Consider
 unprefixed expressions synonyms as well.
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>possiblePrefixes</CODE> - The collection of expression prefixes supported</DL>
</DL>

<!-- ============ METHOD DETAIL ========== -->

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<A NAME="hasRecursiveExpression(java.lang.String)"><!-- --></A><H3>
hasRecursiveExpression</H3>
<PRE>
public boolean <B>hasRecursiveExpression</B>(java.lang.String&nbsp;expression)</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../../org/codehaus/plexus/interpolation/RecursionInterceptor.html#hasRecursiveExpression(java.lang.String)">RecursionInterceptor</A></CODE></B></DD>
<DD>Check whether the given value contains an expression that is currently
 being tracked by this interceptor. If so, that expression is still in
 the process of being resolved, and this constitutes an expression cycle.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/codehaus/plexus/interpolation/RecursionInterceptor.html#hasRecursiveExpression(java.lang.String)">hasRecursiveExpression</A></CODE> in interface <CODE><A HREF="../../../../org/codehaus/plexus/interpolation/RecursionInterceptor.html" title="interface in org.codehaus.plexus.interpolation">RecursionInterceptor</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>expression</CODE> - The value to check for expression cycles.
<DT><B>Returns:</B><DD>True if the value contains tracked expressions; false otherwise.</DL>
</DD>
</DL>
<HR>

<A NAME="expressionResolutionFinished(java.lang.String)"><!-- --></A><H3>
expressionResolutionFinished</H3>
<PRE>
public void <B>expressionResolutionFinished</B>(java.lang.String&nbsp;expression)</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../../org/codehaus/plexus/interpolation/RecursionInterceptor.html#expressionResolutionFinished(java.lang.String)">RecursionInterceptor</A></CODE></B></DD>
<DD>Signal to the interceptor that the all efforts to resolve the given
 expression have completed - whether successfully or not is irrelevant -
 and that the expression should not be tracked for recursion any longer.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/codehaus/plexus/interpolation/RecursionInterceptor.html#expressionResolutionFinished(java.lang.String)">expressionResolutionFinished</A></CODE> in interface <CODE><A HREF="../../../../org/codehaus/plexus/interpolation/RecursionInterceptor.html" title="interface in org.codehaus.plexus.interpolation">RecursionInterceptor</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>expression</CODE> - The expression to stop tracking.</DL>
</DD>
</DL>
<HR>

<A NAME="expressionResolutionStarted(java.lang.String)"><!-- --></A><H3>
expressionResolutionStarted</H3>
<PRE>
public void <B>expressionResolutionStarted</B>(java.lang.String&nbsp;expression)</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../../org/codehaus/plexus/interpolation/RecursionInterceptor.html#expressionResolutionStarted(java.lang.String)">RecursionInterceptor</A></CODE></B></DD>
<DD>Log the intention to start resolving the given expression. This signals
 the interceptor to start tracking that expression to make sure it doesn't
 come up again until after it has been resolved (or, fails to resolve).
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/codehaus/plexus/interpolation/RecursionInterceptor.html#expressionResolutionStarted(java.lang.String)">expressionResolutionStarted</A></CODE> in interface <CODE><A HREF="../../../../org/codehaus/plexus/interpolation/RecursionInterceptor.html" title="interface in org.codehaus.plexus.interpolation">RecursionInterceptor</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>expression</CODE> - The expression to be resolved.</DL>
</DD>
</DL>
<HR>

<A NAME="getExpressionCycle(java.lang.String)"><!-- --></A><H3>
getExpressionCycle</H3>
<PRE>
public java.util.List <B>getExpressionCycle</B>(java.lang.String&nbsp;expression)</PRE>
<DL>
<DD>When an expression is determined to be a recursive reference, this method
 returns the sublist of tracked expressions that participate in this cycle.
 Otherwise, if the expression isn't present in the in-process stack, return
 <CODE>Collections.EMPTY_LIST</CODE>. Also, if the expression doesn't have a matched
 prefix from this interceptor's list, and unprefixed expressions aren't allowed
 then return <CODE>Collections.EMPTY_LIST</CODE>.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/codehaus/plexus/interpolation/RecursionInterceptor.html#getExpressionCycle(java.lang.String)">getExpressionCycle</A></CODE> in interface <CODE><A HREF="../../../../org/codehaus/plexus/interpolation/RecursionInterceptor.html" title="interface in org.codehaus.plexus.interpolation">RecursionInterceptor</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>The list of expressions that participate in the cycle caused by
 the given expression.</DL>
</DD>
</DL>
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